Question

6. A water tap discharges 90 litre water per hour. It takes 5 hours to fill a water tank If it's capacity is
decreased to 81 litre per hour, how long will it take to fill the tank now?

please solve with full definition ​

Answer 1

Answer:

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Step-by-step explanation:

The tap fills a 90-litre tank in 90/20 = 4.5 hours.

The leak empties the 90-litre tank in 90*5/20 = 22.5 hours.

So the tap and the leak fill (1/4.5)-(1/22.5) = (5–1)/22,5 = (4/22.5)th of the tank in 1 hour.

Or the tap and the leak will fill the 90-litre tank in 22.5/4 = 5.625 hours or 5 hours and 37.5 minutes.